What you are describing sounds like etching. When acidic substances come in contact with marble and other calcite based stones, a chemical reaction occurs and what results is what you are describing. We can polish out the etching and restore your antique table top to its original state. To help prevent further damage, be sure to use coasters under drinks and clean up any spills as quickly as possible. Most importantly use only cleaning products designated safe for natural stone. Definitely don't use vinegar and water to clean your marble
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